The supply of water to any land which is entitled to such supply under section 17 or 18 shall not be stopped except,-
(a) whenever and so long as it is necessary to stop such supply for the purpose for executing any work ordered by the Authority;
(b) whenever and so long as any field-channel by which such supply is received, is not maintained in such repair as to prevent the wasteful escape of water thereof;
(c) whenever and so long as it is necessary to do so in order to supply in rotation the legitimate demands of land holders entitled to water;
(d) whenever and so long as it may be necessary to do so in order to prevent the wastage or the misuse of water;
(e) within the periods fixed from time to time by the Authority, of which, due notice shall be given; and
(f) whenever there is diminution in the supply of water in the irrigation work due to any natural or seasonal causes and so long as it is necessary to do so.